0.05). The notch width index was 0.24?0.05. There was no correlation between the notch width index and the height (r=-0.11), the body weight (r=-0.13), and the age (r=-0.28). Conclusion The notch-view radiographs with 45? flexion of the knee can satisfactorily show the shape and the width of the intercondylar notch. The notch width and the notch width index of the normal knee are (18.9?4.8) mm and 0.24?0.05, respectively. The height and the body weight can′t be used to predict the notch width. The study supplies the radiographic basis for the diagnosis and treatment of the diseases related with the femoral intercondylar notch.